Spark-arrester



Y (NoMoael.)

E. DUNN 8u R. H. HAVENER. Spark-Arrests?.

No. 227,420. Patented May 11, 1880` A TTYS.

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UNITED STATES PATENT OFFICE.

EDWARD DUNN AND RICHARD H. HAVENER, OF ALEXANDRIA, VIRGINIA.

SPARK-ARRESTER.

SPECIFICATIGN forming part of Letters Patent No. 227,420, dated May 11,1880.

Application nieu April 1o, leso. (No model.)

To all whom it may concern Be it known that we, EDWARD DUNN and RICHARDH. HAVENER, of the city and county ot' Alexandria, in the State ofVirginia, have invented a new and Improved Spark-Arrester; and we dohereby declare the following to be a full, clear, and exact descriptionofthe same, reference being had to the accompanying drawin gs, an d tothe letters of reference marked thereon.

This invention consists mainly in the combination, with a closed boxproperly connected to the stack, of certain means for creating avacuumin the box, as will be fully Vdescribed hereinafter. Y

1u the drawings, Figure l is a central trans versevertica-l sectionalelevation of the smokestaek; and Fig. 2, detail views of thededectinglplate c and its equivalent, an upwardlyextending pipe.

rIo enable others skilled in the art to make and use our improvedspark-arrester, we will proceed to describe fully the construction ofthe same and the manner of its operation.

A, Fig. l, represents a smokestack, constructed generally in any propermanner, but essentially provided with a .central deliverypipe, a, havingthe detlector a', and the usual funnel-shaped jacket (t2, inclosingthesame.

B represents any suitable box or receptacle, located at any proper pointupon the locomotive, which is connected, by means of a pipe, b, with thechamber x, between the pipe a and jacket (t2.

O, Figs. l and 2, represents a pipe opening at one end into the interiorof pipe a and at the other into the pipe b, as shown, or into the box B,if desired, as indicated in dotted lines.

c represents a detlecting-plate, located at the lower side of the pipeO, for the purpose of preventing the entrance into the pipe of theascending gases and products of combustion.

If desired, the pipe C itself may be extended into the pipe a, as shownin Fig. 2.

D, Fig. 1, represents the exhaust-nozzles, of

the usual constructions.

The operation is substantially as follows The nozzles D exhaust into thepipe a in the usual manner. By the action of the exhaust the air in boxB is caused to move up through the pipe c in the direction of the arrowsand out of pipe c. A partial vacuum thus being formed in the box B, airfrom the upper part of the stack is necessarily drawn into the samethrough the chamber .c and pipe b. A constant circulation thus beingeffected through the box, the sparks are led into the same and theredeposited.

The box is provided, of course, with a proper opening, by means of whichit may be emptied when desired.

The construction of the parts is Very simple, and yet very effectiveresults are obtained by their employment.

If desired, a vacuum may be formed in the box by means of a pipe leadingdirectly in the smoke box, as indicated in dotted lines, in which casethe pipe O will be dispensed with.

Having thus fully described our invention, what we claim as new, anddesire to secure by Letters Patent, is-

l. The combination of the following elements: a closed box properlyconnected to the stack, and means, substantially as described, forcreating a vacuum in the box, as and for the purpose specified.

2. In combination with the stack having the pipe u. and jacket a2, thebox B, having the pipe b and the pipe C, substantially as described.

This specification signed and witnessed this 9th day of April, 1880.

EDWARD DUNN. RICHARD H. HAVENER.

Witnesses:

W. H. MAY, H. W.,BEADLE.

